File: index1.js

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mongodb 1%3A2.4.10-5
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t = db.perf.index1;
t.drop();

for ( var i=0; i<100000; i++ ){
    t.save( { x : i } );
}

t.findOne();

printjson( db.serverStatus().mem );

for ( var i=0; i<5; i++ ){
    nonu = Date.timeFunc( function(){ t.ensureIndex( { x : 1 } ); } );
    t.dropIndex( { x : 1 } );
    u = Date.timeFunc( function(){ t.ensureIndex( { x : 1 }, { unique : 1 } ); } );
    t.dropIndex( { x : 1 } );
    print( "non unique: " + nonu + "   unique: " + u );
    printjson( db.serverStatus().mem );
}